I think the recent programme was a repeat from some time ago (I did find some previous conversations about the same programme on this very forum but can't find 'em now!) so that, combined with the niche subject matter, probably makes it not very popular with the cappers! :o)
The US programme you mention is possibly a repeat from the National Geographic channel... And if it is, it's not bad, but as you say, VERY repetitive! And it DOES feature Foamhenge and several of us from here trying to "row" a 13 ton block of concrete!
G x